Datasheet

LM2597, LM2597HV
www.ti.com SNVS119C –MARCH 1998–REVISED APRIL 2013
Typical Performance Characteristics (continued)
Continuous Mode Switching Waveforms Discontinuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 400 mA V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 200 mA
L = 100 μH, C
OUT
= 120 μF, C
OUT
ESR = 140 mΩ L = 33 μH, C
OUT
= 220 μF, C
OUT
ESR = 60 mΩ
A: Output Pin Voltage, 10V/div.
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
C: Output Ripple Voltage, 20 mV/div.
Figure 22. Horizontal Time Base: 2 μs/div. Figure 23. Horizontal Time Base: 2 μs/div.
Load Transient Response for Continuous Mode Load Transient Response for Discontinuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 200 mA to 500 mA V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 100 mA to 200 mA
L = 100 μH, C
OUT
= 120 μF, C
OUT
ESR = 140 mΩ L = 33 μH, C
OUT
= 220 μF, C
OUT
ESR = 60 mΩ
A: Output Voltage, 50 mV/div. (AC)
A: Output Voltage, 50 mV/div. (AC)
B: 100 mA to 200 mA Load Pulse
B: 200 mA to 500 mA Load Pulse
Figure 24. Horizontal Time Base: 50 μs/div. Figure 25. Horizontal Time Base: 200 μs/div.
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